CN216980302U - Inductor - Google Patents

Abstract

The application provides an inductor, which relates to the technical field of inductance and comprises a first magnetic core, a second magnetic core and two sleeves connected to form a base, wherein the two sleeves are arranged in parallel, coils are wound on the peripheries of the sleeves, the number of the coils on the two sleeves is the same, the winding direction is opposite, a plurality of partition plates are further arranged on the peripheries of the sleeves, the partition plates divide a winding area wound with the coils into a plurality of sub-areas through the partition coils, when the coils are wound on the winding area in a certain winding direction, one end of each coil is wound along a winding groove, then the winding is continued in the winding groove on the other side of the partition plate across the partition plates, then the winding across partition plates is continued until the winding is finished, so that the coils can be separated by the partition plates when the coils are wound on the winding area on the peripheries of the sleeves, the coils in two adjacent sub-areas can be separated by the partition plates, and the distributed capacitance of the coils is effectively reduced, thereby effectively improving the performance of the inductor.

Description

Inductor

Technical Field

The application relates to the technical field of anti-electromagnetic interference filter inductors, in particular to an inductor.

Background

Differential mode inductance and common mode inductance are EMI devices often used in electronic circuits, and are generally manufactured, installed and used as two independent devices respectively. At present, a common mode inductor is formed by respectively winding two same coils on a closed magnetic core by using enameled wires, and common mode noise interference in a circuit is filtered or suppressed by using a common mode inductance generated by the common mode inductor; in addition, a single-coil inductor (commonly called a differential-mode inductor) is used to filter or suppress the differential-mode noise interference in the circuit.

In the existing inductor, after the coil is wound on the periphery of the magnetic core, the distributed capacitance generated by the coil is large, so that the performance of the inductor is influenced, and how to design a good structure to reduce the distributed capacitance becomes the most critical factor.

SUMMERY OF THE UTILITY MODEL

The present application aims to provide an inductor to solve the problem that the performance of a device is affected due to the large distributed capacitance generated by a coil in the existing inductor.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

in one aspect of the embodiment of the application, an inductor is provided, including first magnetic core, second magnetic core and two connect the sleeve that forms the base, two sleeve parallel arrangement, it is equipped with the coil to wind in the sleeve periphery, the number of turns of the coil on two sleeves is the same and wire winding opposite direction, still be provided with a plurality of baffles in the sleeve periphery, the baffle divides into a plurality of subregions through separating the coil in order to wind the winding district that is equipped with the coil, telescopic relative both ends all are provided with the opening, first magnetic core is inserted the one end of locating the base by two openings with one side of two sleeves respectively, the other end of locating the base is inserted by two openings of two sleeve opposite sides respectively to the second magnetic core.

Optionally, the partition is an annular partition, and the annular partition is provided with a crossover groove communicating sub-regions on two opposite sides of the annular partition, so that the coil wound around the same sleeve is wound around the sub-region on one side of the annular partition via the crossover groove.

Optionally, the first magnetic core includes a first connection portion, and a first side column and a second side column respectively connected to two opposite end portions of the first connection portion and extending in the same direction, and the first side column and the second side column are respectively inserted into the openings of the two sleeves at one end of the base in a one-to-one correspondence; the second magnetic core comprises a second connecting part, a third side column and a fourth side column which are respectively connected to two opposite end parts of the second connecting part and extend in the same direction, and the third side column and the fourth side column are respectively inserted into the openings of the two sleeves in a one-to-one correspondence mode at the other end of the base; and first limit post and third limit post are located same sleeve, and second limit post and fourth limit post are located same sleeve to form annular magnetic circuit by first limit post, second limit post, first connecting portion, third limit post, fourth limit post and second connecting portion.

Optionally, an accommodating space is further formed between the two sleeves, the first magnetic core further includes a first middle pillar connected to the first connecting portion at an end thereof and located between the first side pillar and the second side pillar, the second magnetic core further includes a second middle pillar connected to the second connecting portion at an end thereof and located between the third side pillar and the fourth side pillar, and the accommodating space is inserted into the first middle pillar and the second middle pillar at opposite sides of the base, respectively, so that the first middle pillar and the second middle pillar form a magnetic leakage shunt located in the annular magnetic circuit.

Optionally, there is a gap between the first and second center pillars.

Optionally, the radial cross-sectional area of the first center pillar is greater than or equal to the radial cross-sectional areas of the first side pillar and the second side pillar, and the radial cross-sectional area of the second center pillar is greater than or equal to the radial cross-sectional areas of the third side pillar and the fourth side pillar.

Optionally, the base further includes a base and a top seat respectively disposed at opposite ends of each sleeve having an opening, via holes communicated with the corresponding openings are respectively disposed on the base and the top seat, and the bases on the two sleeves are in butt joint with the base and the top seat to form the base.

Optionally, a lead terminal is arranged on the base of each sleeve, and the lead terminal is electrically connected with a coil wound around the same sleeve.

Optionally, a hook is arranged on the top seat, and a wiring groove extending from the top seat to the base is further arranged on the periphery of the sleeve, so that one end of the coil wound around the same sleeve is hung on the hook and then electrically connected with the lead terminal through the wiring groove.

Optionally, a first through groove and a first protrusion which are matched with each other are respectively arranged on the bases which are butted with each other, a second through groove and a second protrusion which are matched with each other are respectively arranged on the footstock which is butted with each other, and the extending direction of the first through groove is perpendicular to the extending direction of the second through groove.

The beneficial effect of this application includes:

the application provides an inductor, including first magnetic core, second magnetic core and two connect the sleeve that forms the base, two sleeve parallel arrangement, it is equipped with the coil to wind in the sleeve periphery, the number of turns of the coil on two sleeves is the same and wire winding opposite direction, still be provided with a plurality of baffles in the sleeve periphery, the baffle divides into a plurality of subregions through separating the coil in order to wind the winding district that is equipped with the coil, telescopic relative both ends all are provided with the opening, first magnetic core is inserted the one end of locating the base respectively by two openings of two sleeves with one side, the second magnetic core is inserted the other end of locating the base respectively by two openings of two sleeve opposite sides. When the coil is wound in the winding area in a certain winding direction, one end of the coil is wound along the winding groove, then the coil is wound in the winding groove on the other side of the partition plate across the partition plate, and the winding is finished until the winding is finished, so that the coil can be separated by the partition plate when the coil is wound in the winding area on the periphery of the sleeve, the coil in two adjacent sub-areas can be separated by the partition plate, the distributed capacitance of the coil is effectively reduced, and the performance of the inductor is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of an inductor according to an embodiment of the present disclosure;

fig. 2 is a second schematic structural diagram of an inductor according to an embodiment of the present disclosure;

fig. 3 is an exploded view of an inductor according to an embodiment of the present application;

fig. 4 is a third schematic structural diagram of an inductor according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram illustrating an inductor operating in a common mode according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram illustrating a principle of an inductor operating in a differential mode signal according to an embodiment of the present disclosure.

Icon: 100-a sleeve; 101-a via hole; 102-a top seat; 103-a base; 110-annular partition; 120-a wire spanning groove; 130-hook; 140-a wiring trough; 150-winding area; 151-sub-region; 161-a second through slot; 162-a second projection; 163-a first through slot; 164-a first projection; 210-a first magnetic core; 211-a first newel; 212-a first connection; 213-first side column; 214-a second side post; 220-a second magnetic core; 221-a second newel; 222-a second connection; 223-third side column; 224-fourth side column; 230-a gap; 300-lead terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. It should be noted that, in case of conflict, various features of the embodiments of the present application may be combined with each other, and the combined embodiments are still within the scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In one aspect of the embodiments of the present application, an inductor is provided, as shown in fig. 1 to 4, including a first magnetic core 210, a second magnetic core 220, a coil (not shown in the figure), and a base, where the base includes two sleeves 100, and the coil is respectively wound around the outer peripheries of the two sleeves 100.

As shown in fig. 1 to 3, the axes (dotted lines in fig. 2) of the two sleeves 100 are parallel to each other, a coil is wound around the outer periphery of each sleeve 100, the number of coils wound around the two sleeves 100 is the same, but the winding directions of the coils are opposite, the opposite ends of each sleeve 100 are provided with openings communicating with the inner cavity, and as shown in fig. 1 and 3, the two portions of the first magnetic core 210 are respectively inserted into the two openings at the bottom end of the two sleeves 100 from the lower end of the base in a one-to-one correspondence manner, and similarly, the two portions of the second magnetic core 220 are also respectively inserted into the two openings at the top end of the two sleeves 100 from the upper end of the base in a one-to-one correspondence manner, so that a portion of the first magnetic core 210 and a portion of the second magnetic core 220 are formed by inserting the opposite ends of one sleeve 100 into the inner cavity of the sleeve 100, and the other portion of the first magnetic core 210 and the other portion of the second magnetic core 220 are inserted into the inner cavity of the sleeve 100 from the opposite ends of the other sleeve 100 The inner cavity of the sleeve 100 is formed such that the first magnetic core 210 and the second magnetic core 220 inserted into the sleeve 100 are engaged with a coil wound around the outside of the sleeve 100, and when the coil is energized, an inductor can be formed.

As shown in fig. 1 to 4, a region of the outer periphery of the sleeve 100 for winding the coil may be used as a winding region 150, a plurality of partitions may be disposed in the winding region 150 at the outer periphery of the sleeve 100, the winding region 150 may be divided into a plurality of sub-regions 151 by the partitions, and a plurality of winding slots are formed by surfaces of the sub-regions 151 in cooperation with the partitions, such that when the coil is wound in a certain winding direction in the winding region 150, one end of the coil is wound along the winding slot, then the winding is continued in the winding slot at the other side of the partition across the partition, and then the winding is continued across the partition until the winding is completed, so that the coil can be separated by the partitions while being wound around the winding region 150 at the outer periphery of the sleeve 100 (it should be understood that only parts of the coil are separated from the view of the distribution region, and the current path of the same coil is not blocked), so that the coils in two adjacent sub-regions 151 can be separated by the partitions, therefore, the distributed capacitance of the coil is effectively reduced, and the performance of the inductor is effectively improved.

In some embodiments, the separator is an insulating separator and the sleeve 100 is an insulating sleeve 100.

In some embodiments, as shown in fig. 2, the plurality of spacers disposed on the outer periphery of each sleeve 100 are spaced and uniformly distributed along the axial direction of the sleeve 100, so that the distributed capacitance distribution of each portion of the coil wound on the outer periphery of the sleeve 100 is more uniform, and the device performance is further improved.

Optionally, as shown in fig. 3 and fig. 4, the partition board is an annular partition board 110, the sleeve 100 is located at an inner circle of the annular partition board 110, in order to facilitate the coil of the sub-area 151 on one side of the partition board to be more conveniently wound to the sub-area 151 on the other side of the partition board, a crossover groove 120 communicating with the sub-areas 151 on two opposite sides of the annular partition board 110 may also be formed in the annular partition board 110, so that, when the coil is wound around the outer circumference of the sleeve 100, the coil can be wound around the sub-area 151 on the other side of the annular partition board 110 through the crossover groove 120 by the sub-area 151 on one side of the annular partition board 110, and does not need to be jacked up by the partition board due to the protrusion of the partition board when the coil crosses the partition board.

Optionally, as shown in fig. 1 to fig. 3, the first magnetic core 210 includes a first connection portion 212, and a first side column 213 and a second side column 214 connected to two opposite end portions of the first connection portion 212, respectively, and the first side column 213 and the second side column 214 extend in the same direction, so that when the first magnetic core 210 is inserted into the base at one end of the base, as shown in fig. 3, the first side column 213 and the second side column 214 can be inserted into the openings of the two sleeves 100 at the bottom end from the bottom end of the base in a one-to-one correspondence manner, respectively.

Similarly, the second magnetic core 220 includes a second connecting portion 222, and a third side column 223 and a fourth side column 224 respectively connected to two opposite ends of the second connecting portion 222, and the third side column 223 and the fourth side column 224 extend in the same direction, so that when the second magnetic core 220 is inserted into the base at the other end of the base, as shown in fig. 3, the third side column 223 and the fourth side column 224 can be inserted into the openings at the top ends of the two sleeves 100 from the top end of the base in a one-to-one correspondence manner.

Therefore, the first side column 213 and the third side column 223 extend into the sleeve 100 at two opposite openings of the same sleeve 100, the second side column 214 and the fourth side column 224 extend into the sleeve 100 at two opposite openings of the same sleeve 100, and when the two coils are electrified, a circular magnetic circuit is formed by the first side column 213, the second side column 214, the first connecting part 212, the third side column 223, the fourth side column 224 and the second connecting part 222, so that a common mode inductor can be formed.

In some embodiments, the first leg 213 and the third leg 223 contact each other at opposite ends of the same sleeve 100, and the second leg 214 and the fourth leg 224 contact each other at opposite ends of the same sleeve 100, so as to avoid a gap 230 between them, thereby effectively reducing the reluctance-ratio between the two legs inside each coil.

In some embodiments, the contact surfaces of the opposite ends of the first leg 213 and the third leg 223 in the same sleeve 100 are both flat, e.g., mirror-finished smooth surfaces, and the contact surfaces of the opposite ends of the second leg 214 and the fourth leg 224 in the same sleeve 100 are both flat, e.g., mirror-finished smooth surfaces, thereby further increasing the contact area between the two legs and reducing the reluctance-ratio between the two legs inside each coil.

In some embodiments, the material of each of the first and second magnetic cores 210 and 220 may be a high permeability soft magnetic material.

Alternatively, as shown in fig. 1 to 3, a receiving space is further formed between the two sleeves 100, the first magnetic core 210 further includes a first center pillar 211 having an end connected to the first connection part 212 and located between the first side pillar 213 and the second side pillar 214, the second magnetic core 220 further includes a second center pillar 221 having an end connected to the second connection part 222 and located between the third side pillar 223 and the fourth side pillar 224, that is, the first magnetic core 210 and the second magnetic core 220 are both in an E-shaped structure, the first center pillar 211 and the second center pillar 221 are respectively inserted into the receiving spaces at opposite sides of the base, and the two magnetic cores are inserted into the base to form a structure similar to a Chinese character 'ri', and the first and second center legs 211 and 221 are positioned between the two coils on the two sleeves 100, in this way, the first center leg 211 and the second center leg 221 form a leakage flux shunt in the toroidal magnetic path, thereby forming a differential-mode and common-mode integrated inductor.

Alternatively, as shown in fig. 2, a gap 230 is formed between the first and second legs 211 and 221, and the magnitude of the resistance of the magnetic shunt can be changed by adjusting the magnitude of the gap 230 between the first and second legs 211 and 221 in the middle, thereby changing the magnitude of the differential mode resistance.

The working principle of the method will be schematically described in conjunction with fig. 5 and 6 as follows:

when the inductor works in the common mode, as shown in fig. 5, according to the electromagnetic induction principle, when the common mode signals with the same polarity and the same amplitude are applied to the coil 1 and the coil 2 (the two coils are respectively the coils wound on the two sleeves 100) (i.e. the current I is applied to the coil 1)₁Applying a current I to the coil 2₂) When the magnetic fluxes Φ 1 and Φ 2 in the same phase are generated according to the right-hand helicity law, the magnetic fluxes in the intermediate leakage magnetic paths cancel each other (that is, Φ 1b- Φ 2b are equal to 0), and the magnetic resistance of the intermediate leakage magnetic paths becomes infinite, so that most of the magnetic fluxes pass through the toroidal magnetic paths Φ 1a and Φ 2a, the total magnetic flux passing through the coil 1 is Φ 1+ Φ 2a, and the total magnetic flux passing through the coil 2 is Φ 2+ Φ 1a, and thus a high common mode impedance is exhibited.

As shown in FIG. 6, when a differential mode signal with the same polarity and the same amplitude is applied to the coil 1 and the coil 2 (i.e. a current I is applied to the coil 1)₁Applying a current I to the coil 2₂) When the magnetic field is applied, according to the right-hand spiral law, opposite-phase magnetic fluxes Φ 1 and Φ 2 are generated, the magnetic flux in the middle leakage shunt is Φ 1b + Φ 2b, since Φ 1a and Φ 2a cancel each other, the magnetic flux passing through the coil 1 is Φ 1b, the magnetic flux passing through the coil 2 is Φ 2b, an incremental differential mode impedance is additionally generated, and the impedance of the magnetic shunt can be changed by adjusting the size of the gap 230 between the middle first center pillar 211 and the middle second center pillar 221And thus the magnitude of the differential mode impedance.

The differential-mode common-mode inductor realizes the magnetic integration of the common-mode inductor and the differential-mode inductor, simultaneously enables the common-mode magnetic circuit to keep high magnetic conductivity and easily obtain larger common-mode inductance value, keeps low magnetic conductivity and high anti-saturation capacity of the differential-mode magnetic circuit, and prevents the magnetic core from being saturated due to the direct current bias of the differential-mode loop. Compared with the traditional scheme that two inductors (the common-mode inductor and the differential-mode inductor) are used at the same time to respectively inhibit the common-mode interference and the differential-mode interference, the inductor of the embodiment has smaller integral volume.

The difference common mode inductor simultaneously realizes the sharing of the magnetic core and the coil of the common mode inductor and the difference mode inductor, compared with a common difference mode magnetic integration scheme in the prior art, the E-shaped magnetic core is adopted in the embodiment, and meanwhile, the coil is wound on two side columns of the magnetic core, so that the materials of the magnetic core and the coil are saved, and the loss is reduced. In addition, from the process perspective, E-shaped magnetic core manufacturing and mirror surface processing belong to mature processes. Since the center pillar of the E-shaped magnetic core in the above embodiment is provided with the adjustable gap 230, a part of the center pillar can be cut off by a grinding machine or the like during the processing, and the differential mode inductance value and the anti-saturation capability can be controlled by adjusting the length of the cut-off part, thereby realizing the adjustment of the differential mode inductance value.

Optionally, as shown in fig. 3, the radial cross-sectional area of the first center leg 211 is greater than or equal to the radial cross-sectional area of the first side leg 213, and is also greater than or equal to the radial cross-sectional area of the second side leg 214; similarly, the radial cross-sectional area of the second central pillar 221 is greater than or equal to the radial cross-sectional area of the third side pillar 223 and is also greater than or equal to the radial cross-sectional area of the fourth side pillar 224, and compared with the scheme that the radial cross-sectional area of the central pillar is less than the radial cross-sectional area of the side pillars, the gap 230 between the central pillars is not too small under specific parameters, the gap 230 is better controlled, and the saturation performance of the differential mode inductance is also higher.

Optionally, as shown in fig. 2 to 4, the base further includes a base 103 and a top seat 102 disposed at opposite ends of each sleeve 100 having an opening, in order to facilitate the insertion of the first magnetic core 210 and the second magnetic core 220, through holes 101 communicating with the corresponding openings are also disposed on the base 103 and the top seat 102, respectively, and when the first magnetic core 210 and the second magnetic core 220 are inserted into the base, the first magnetic core 210 and the second magnetic core 220 may be inserted into the sleeve 100 after passing through the holes 101. The base 103 and the top 102 of the two sleeves 100 are butted with each other, and the base 103 and the top 102 are butted with each other, so that the two sleeves 100 are connected to form a base.

Alternatively, as shown in fig. 1 to 4, two lead terminals 300 are provided on the base 103 of each sleeve 100, so that the two lead terminals 300 can be electrically connected to two ends of a coil wound around the outer circumference of the same sleeve 100, respectively.

Optionally, as shown in fig. 1 to 4, a hook 130 is further disposed on the top seat 102, and the wound coil can be hung on the hook 130 through the hook 130, so as to be better fixed on the outer periphery of the sleeve 100. A wire groove 140 extending from the top seat 102 to the bottom seat 103 is further disposed on the outer circumference of the sleeve 100, that is, the wire groove 140 may penetrate the top seat 102, the partition and the bottom seat 103, so that one end of the coil wound around the same sleeve 100 is hung on the hook 130 and then electrically connected to the lead terminal 300 through the wire groove 140. Through couple 130 and trough 140, convenience when can further improvement equipment improves the packaging efficiency.

Optionally, as shown in fig. 2 to 4, a first through groove 163 and a first protrusion 164 that are matched with each other are respectively disposed on the bases 103 that are butted to each other, a second through groove 161 and a second protrusion 162 that are matched with each other are respectively disposed on the top bases 102 that are butted to each other, and an extending direction of the first through groove 163 is perpendicular to an extending direction of the second through groove 161, so that when the two sleeves 100 are spliced together in a butted manner, a coil wound around the periphery of the sleeve 100 can be well positioned, convenience in assembly can be further improved, and assembly efficiency is improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The utility model provides an inductor, its characterized in that includes first magnetic core, second magnetic core and two sleeves of connecting formation base, two sleeve parallel arrangement sleeve periphery is around being equipped with the coil, two the number of turns of coil on the sleeve is the same and wire winding opposite direction sleeve periphery still is provided with a plurality of baffles, the baffle is through separating the coil is in order to be equipped with around the wire winding district of coil divides a plurality of subregions, telescopic relative both ends all are provided with the opening, first magnetic core is respectively by two the sleeve is inserted with two openings of one side and is located the one end of base, the second magnetic core is respectively by two openings of sleeve opposite side are inserted and are located the other end of base.

2. The inductor as claimed in claim 1, wherein the partition is a circular partition, and the circular partition is provided with a crossover groove communicating with the sub-areas on opposite sides of the circular partition, so that the coil wound around the same sleeve is wound from the sub-area on one side of the circular partition to the sub-area on the other side of the circular partition through the crossover groove.

3. The inductor according to claim 1, wherein the first magnetic core includes a first connecting portion, and a first side pillar and a second side pillar connected to opposite ends of the first connecting portion, respectively, and extending in the same direction, the first side pillar and the second side pillar are inserted into the openings of the two sleeves at one end of the base in a one-to-one correspondence;

the second magnetic core comprises a second connecting part, a third side column and a fourth side column which are respectively connected to two opposite end parts of the second connecting part and extend in the same direction, and the third side column and the fourth side column are respectively inserted into the openings of the two sleeves in one-to-one correspondence at the other end of the base;

and the first side column and the third side column are located on the same side of the sleeve, the second side column and the fourth side column are located on the same side of the sleeve, so that an annular magnetic circuit is formed by the first side column, the second side column, the first connecting part, the third side column, the fourth side column and the second connecting part.

4. The inductor as claimed in claim 3, wherein a receiving space is further formed between the two sleeves, the first magnetic core further includes a first center pillar connected at an end thereof to the first connecting portion and located between the first side pillar and the second side pillar, the second magnetic core further includes a second center pillar connected at an end thereof to the second connecting portion and located between the third side pillar and the fourth side pillar, the first center pillar and the second center pillar being inserted into the receiving space at opposite ends of the base, respectively, to form a leakage flux shunt located in the circular magnetic circuit from the first center pillar and the second center pillar.

5. The inductor of claim 4, wherein there is a gap between the first and second center legs.

6. The inductor of claim 4, wherein a radial cross-sectional area of each of the first center leg is greater than or equal to a radial cross-sectional area of each of the first and second side legs, and wherein a radial cross-sectional area of each of the second center leg is greater than or equal to a radial cross-sectional area of each of the third and fourth side legs.

7. The inductor of claim 1, wherein the base further comprises a base and a top seat respectively disposed at opposite ends of each of the sleeves having an opening, wherein vias communicating with the corresponding openings are respectively disposed on the base and the top seat, and wherein the base and the base on the two sleeves are butted together, and the top seat are butted together, to form the base.

8. An inductor as claimed in claim 7, wherein lead terminals are provided on the base of each said sleeve, said lead terminals being electrically connected to a coil wound around the same sleeve.

9. The inductor as claimed in claim 8, wherein a hook is provided on the top base, and a wiring groove extending from the top base to the base is further provided on the outer circumference of the sleeve, so that one end of the coil wound around the same sleeve is hung on the hook and then electrically connected to the lead terminal through the wiring groove.

10. The inductor according to claim 7, wherein a first through groove and a first protrusion are respectively disposed on the bases butted against each other, a second through groove and a second protrusion are respectively disposed on the footstock butted against each other, and an extending direction of the first through groove is perpendicular to an extending direction of the second through groove.

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